Function getPNGData

src/app/script/api/image_script.cpp:84–103

  }

  std::string getPNGData() {
    auto w = img()->width();
    auto h = img()->height();
    std::shared_ptr<she::Surface> surface{
      she::instance()->createRgbaSurface(w, h),
      [](auto s) {s->dispose();}
    };
    if (!surface)
      return "";

    for (auto y = 0; y < h; ++y) {
      for (auto x = 0; x < w; ++x) {
        surface->putPixel(img()->getPixel(x, y), x, y);
      }
    }

    std::string encoded;
    base::encode_base64(she::instance()->encodeSurfaceAsPNG(surface.get()), encoded);
    return "data:image/png;base64," + encoded;
  }

  void putPixel(int x, int y, int color) {
    if (unsigned(x) < unsigned(img()->width()) && unsigned(y) < unsigned(img()->height()))